桂林石灰岩区名特优植物元素的岩溶响应

在桂林会仙石灰岩地质背景条件下,研究岩溶洼地和山腰部位3种名特优植物体的元素含量特征及对土壤营养的响应关系,为筛选适合岩溶区种植的植物品种以及加强西南岩溶地区石漠化治理提供理论指导。结果表明,在岩溶动力条件驱动下,洼地和山腰部位3种植物体的元素含量及元素生物吸收系数均存在明显差异。进一步相关分析表明,石灰岩地区土壤—植物体系统中元素迁移与植物蒸腾作用密切相关,其中Ca、Mg、N、Zn、P等元素迁移与植物蒸腾系数呈显著正相关,植物体元素迁移受地质背景条件中N、P元素含量影响较大。

Response of elements in famous,special and high-quality plants to karst environment in typical karst region of Guilin

The present experiment was conducted to study the nutritional characteristics and their correlation with the soil nutrients in Euonymus fortunei,Abrus cantoniensis and Nervilia fordii plants,which are known as famous,special and high-quality plants at depression and mountainside in Huixian karst region,Guilin,Guangxi.An attempt has been made to screen some plant varieties which are suitable for planting in karst region and provide theoretical direction for treatment of stony desertification in karst region of Southwest China.It was observed that the element contents in the three plants and their biological absorption coefficient for absorbing nutrient and water from soils at depression and mountainside were significantly different driven by karst dynamic.The correlation analysis showed that the element translocation in soil-plant system of karst region was strongly related to transpirational pools.The Ca,Mg,N,Zn and P content showed a significant and positive correlation with plant transpiration coefficient.The N and P content under geologic background also had a big influence on element translocation in plants.